EN 1.7335 (13CrMo4-5) Chromium-Molybdenum Steel
EN 1.7335 steel is an alloy steel formulated for primary forming into wrought products. 1.7335 is the EN numeric designation for this material. 13CrMo4-5 is the EN chemical designation. It has a moderately high density and can have a very low tensile strength among EN wrought alloy steels.
The properties of EN 1.7335 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.7335 steel to: EN wrought alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
150 to 160
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
21 to 22 %
Fatigue Strength
200 to 220 MPa 28 to 32 x 103 psi
Impact Strength: V-Notched Charpy
31 to 35 J 23 to 26 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
310 to 330 MPa 46 to 47 x 103 psi
Tensile Strength: Ultimate (UTS)
500 to 520 MPa 73 to 75 x 103 psi
Tensile Strength: Yield (Proof)
280 to 310 MPa 41 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
430 °C 800 °F
Melting Completion (Liquidus)
1470 °C 2670 °F
Melting Onset (Solidus)
1420 °C 2600 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
44 W/m-K 25 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.8 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
1.6 kg CO2/kg material
Embodied Energy
21 MJ/kg 8.8 x 103 BTU/lb
Embodied Water
52 L/kg 6.2 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.7
Resilience: Ultimate (Unit Rupture Work)
91 to 97 MJ/m3
Resilience: Unit (Modulus of Resilience)
210 to 260 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
15 points
Alloy Composition
Among alloy steels, the composition of EN 1.7335 steel is notable for including nitrogen (N). Nitrogen has a substantial strengthening effect, but may contribute to strain aging unless the steel is deoxidized with aluminum.
| Fe | 96.4 to 98.4 | |
| Cr | 0.7 to 1.2 | |
| Mn | 0.4 to 1.0 | |
| Mo | 0.4 to 0.6 | |
| Si | 0 to 0.35 | |
| Cu | 0 to 0.3 | |
| C | 0.080 to 0.18 | |
| P | 0 to 0.025 | |
| N | 0 to 0.012 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10222-2: Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels with specified elevated temperature properties
EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties
EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011
Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015